Are lungimea fizică egală cu lungimea de undă (fig. 99). În acest caz, ambele jumătăţi ale antenei se alimentează în punctele de maximă tensiune, şi respectiv, de curent mic, iar impedanţa de intrare a antenei este relativ mare.
Rezistenţa de radiaţie şi lărgimea benzii de trecere depind în mai mare măsură de raportul dintre lungimea de undă şi diametrul conductorului antenei (λ/d) decît la dipolul în semiundă. La un raport egal, lărgimea benzii de trecere este mai mare ca la dipolul în semiundă. În fig. 100 se arată dependenţa rezistenţei de radiaţie faţă de raportul λ/d şi dependenţa de acest raport a coeficientului de scurtare (K). Rezistenţa de radiaţie depinde de asemenea de distanţa dintre cele două jumătăţi ale antenei XX.
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